Solar bases https://sunnightsolar.com/ its profits on a system of loans, which we will explain more thoughtfully in our review. Simply put, customers don’t buy solar panels; they rent them through a long-term contract, a PPA (Power Purchase Agreement). This business model fueled some controversy, to the time of writing not substantiated.Solar is an American solar energy company, founded fairly recently, in 2011, and headquartered in the state of Utah. It focuses primarily on solar energy for houses and residential buildings, and its main activity is designing, installing, and maintaining photovoltaic systems and panels.